package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 涛
 * Date: 2023-09-16
 * Time: 16:08
 */
public class DelOperation implements IOPeration{
    public void work(BookList bookList) {
        System.out.println("删除图书");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的图书");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();
        int i = 0;
        int pos = -1;
        for (i = 0; i < currentSize; i++) {
            Book book = bookList.getBook(i);

            if(book.getName().equals(name)) {
                //System.out.println("有这个下标");
                pos = i;
                break;
            }
        }
        if(i == currentSize) {
            System.out.println("没有你要删除的图书");
            return;
        }
        int j = pos;
        for (j = pos; j < currentSize - 1; j++) {
            Book book = bookList.getBook(j + 1);
            bookList.setBook(j, book);
        }
        bookList.setBook(j,null);
        bookList.setUsedSize(currentSize - 1);
    }
}
